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Installing Lambda oxygen sensor

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NOTE: Grease the threads of new oxygen sensors thinly and evenly.
For oxygen sensors that are reused, the following should be observed:
Thinly and evenly grease the oxygen sensor on the thread only. Do not clean the part of the oxygen sensor that does not protrude into the exhaust line (sensor ceramics) and do not grease.
For additional information see OVERVIEW OF CONSUMABLES .
G14408363Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: The cable of the Lambda oxygen sensor is black. The installation location of the Lambda oxygen sensor is in front of the catalytic converter.
TIGHTENING TORQUE SPECIFICATIONS

Lambda oxygen sensor on catalytic converter 
M18X1.5 tightening torque  50 Nm
G14408364Courtesy of BMW OF NORTH AMERICA, INC.
G14408366Courtesy of BMW OF NORTH AMERICA, INC.